What's Changed
* Added the ability to configure the units system using the config file by portyanikhin in https://github.com/portyanikhin/PyFluids/pull/15
* Added mass specific volume for the inputs and outputs of fluids, mixtures and humid air by portyanikhin in https://github.com/portyanikhin/PyFluids/pull/16
* Documentation update by portyanikhin in https://github.com/portyanikhin/PyFluids/pull/19
* Fixed as_dict and as_json methods by portyanikhin in https://github.com/portyanikhin/PyFluids/pull/20
**Full Changelog**: https://github.com/portyanikhin/PyFluids/compare/v2.3.2...v2.4.0